Hitachi Construction Machinery Co., Ltd.

Hitachi, Ltd.

Kazuyoshi Hatano

Morio Tamura

Ken Ichiryu

Hisayoshi Hashimoto

Kiyoshi Tanaka

Fujio Sato

Shinji Tanaka

Kazuo Sato

Hiroshi Kanda

Isao Ishikawa

Kuninori Imai

Takeji Shiokawa

Shigeo Kato

Yasuharu Gotoh

Harumasa Onozato

Eiji Kometani

Ken Ichiryuu

Nobuyoshi Hidao

Takao Kawanuma

Genroku Sugiyama

Toshihiro Yamada

Hideki Akita

Mitsuaki Haneda

Susumu Hioki

Nobuyuki Tobita

Wataru Idetsu

Yoshiaki Sekiguchi

Manabu Ogasawara

Makoto Ota

Hideaki Nakatani

Shoji Imanaga

The present invention concerns a crawler belt ( ) incorporating a sealing devices ( ), which are each constituted by a coned disc spring ( ) and a seal ring ( ), to seal up gap spaces between track links ( ) and bushes ( ). A seal anchor hole ( ) is provided in each one of outer link portions ( ) of track links ( ) of the crawler belt ( ), and the sealing device ( ) is fitted in the seal anchor hole ( ) between an outer link portion ( ) and an opposing end face ( A) of a bush ( ). The sealing device ( ) includes the seal ring ( ) in the shape of an O-ring, and the coned disc spring ( ) which is arranged to press the seal ring ( ) resiliently against peripheral wall surface ( B) of the seal anchor hole ( ) and the end face ( A) of the bush ( ).

Crawler belt

The improved slide bearing assembly comprises at least a shaft and a bush that is formed of a porous iron-base sintered material and is characterized in that the bush is impregnated with a lubricant oil having a viscosity of 240-1500 cSt. The bearing assembly can be operated in slow- and high-pressure applications without oil refillings for a prolonged period of at least several years. The shaft is preferably formed of an iron or a steel member that have been subjected to a treatment of surface modification. The slide bearing assembly is preferably used in such an environment that the working pressure applied to the sliding surfaces is at least 6.0 kgf/mm.sup.2 and that the sliding speed is in the range 2-5 cm/sec.

Slide bearing assembly

A sliding member is sulphonitride by heating at 480.degree.-600.degree. C. in the presence of both 10-500 ppm of a hydrogen sulfide gas and a 20-70 vol % ammonia gas, or by a method which comprises performing a primary heat treatment on the sliding member at 450.degree.-540.degree. C. in the presence of 50-200 ppm of a hydrogen sulfide gas and a 10-70 vol % ammonia gas, then ceasing the supply of the ammonia gas, slowly reducing the temperature to a level of 200.degree.-350.degree. C., and performing a secondary heat treatment at that temperature level. By the either method, the sliding member having a FeS.sub.2 on its topmost surface can be obtained.

Method of gas sulphonitriding

A sliding member having a layer of FeS.sub.2 on its surface is formed by sulphonitriding the member by heatint it at 480.degree. C.-600.degree. C. in the presence of both 10-500 ppm of a hydrogen sulfide gas and 20-70 vol % ammonia gas. An alternate heating method involves performing a primary heat treatment on the sliding member at 450.degree.-540.degree. C. in the presence of 50-200 ppm of a hydrogen sulfite gas and a 10-70 vol % ammonia gas, then ceasing the supply of the ammonia gas, slowly reducing the temperature to between 200.degree.-350.degree. C., and performing a secondary heat treatment at that temperature level.

Sliding member, and method and apparatus for producing the same by gas

Pressure sensor

An ultrasonic probe comprising an acoustic lens (20) having a concave lens surface (21) formed on one side of a lens body, and a piezoelectric transducer (23) disposed on the other side of the acoustic lens, ultrasonic waves generated by applying voltage to the piezoelectric transducer being focused through the lens surface to detect the reflected waves of the ultrasonic waves from a sample (26) by the piezoelectric transducer for obtaining information about the surface or interior of the sample. The lens surface (21) of the acoustic lens (20) is defined by an etch profile (15) formed by etching a substrate material (11) which makes up the lens body.

Ultrasonic probe

Ultrasonic probe and manufacture method for same

Aluminum or its alloy is subjected to surface treatment wherein the surface is heated and melted by the heat of an electric arc in an atmosphere of a mixture of inert gas and nitrogen gas. By this treatment, a dense layer of aluminum nitride is formed on the surface of aluminum or its alloy so that material of increased wear resistance is obtained.

Method for melt nitriding of aluminum or its alloy

Growing community of inventors

Ibaraki, Japan

Kazuyoshi Hatano